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Inertia is the property of a body by the virtue of which the body is unable to change by itself

Name the instrument which has the least count :

(a) 0.1 mm (b) 1mm (c) 0.01 mm.

A man eats glucose and then he makes a block move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

A square plate of edge 'd' and a circular disc of diameter 'd' are placed touching each other at the midpoint of an edge of the plate as shown in figure. Locate the centre of mass of the combination, assuming same mass per unit area for the two plates.

If car A is at 40 km/h and car B is at 10 km/h in the opposite direction, what is the velocity of

the car A relative to the car B?

Fig. 2.33 shows displacement-time graph of two vehicles A and B moving along a straight road. Which vehicle is moving faster? Give reason.

A thin copper wire of length $l$ increases its length by 1% when heated from temperature $T_1$ to $T_2$. What is the percentage change in area when a thin copper plate having dimensions $2l\times l$ is heated from $T_1$ to $T_2$?

Two objects , each of mass 1.5kg , are moving in the same straight line but in opposite directions . The velocity of each object is 2.5ms^-1 before the collision during which they stick together . What will be the velocity of the combined object after collision ?

Use the following information to answer the next question.

During an experiment, Mukhtar rubs a plastic comb against his dry hair and then brings the comb near some paper pieces. The paper pieces get attracted toward the comb.

During this experiment,

What is the mass of $5m^3$ of cement of density $3000kg/m^3$ ?

A train is moving with a velocity of 400 m/s with the application of brakes, retardation of $10m{s}^{-2}$ is produced. Calculate the following:

1) after how much time will it stop.

2) how much distance will it cover before it stops.

Identify the part which acts as fuse in the given circuit:

The direction of magnetic lines of force produced by passing a direct current in a straight conductor are :

For a constant resistance, the correct relation between heat produced (H) and electric current (I) flowing is:

F = [K $\times$ m $\times$ (v - u)] / t; can be rewritten as:

Consider the following situation.

The car appears to be in motion with respect to

A car accelerates from rest to 100 m/s in 10 seconds. If the mass of the car is 50 kg then power developed by the engine is___KW.

One body exert force on other body then how and why the other body apply same force and in opposite direction???

Medicines kept in the medical store

What is momentum

Which of the following statements is correct about the wave number?

a train is moxing with a speed of 30 km/h and returns back with a speed of

40 km/h. find its average speed and average velocity

How does the pressure at a certain depth in sea water differ from that at the same depth in river water? Explain your answer.

Comment on th statement the sum of action and reaction on a body is zero'

In the given mirror

C – centre of the sphere to which the mirror is part of

F – focus of the mirror

P – pole of mirror

A – point on mirror

D – point on the principal axis

If a ray of light starts from C and is incident on A, then from which point the reflected ray will pass through?

Name the principle on which a rocket works.

In an experiment to measure his power, a student records the time taken by him in running up a flight of steps on a staircase. Use the following data to calculate the power of the student :

Number of steps = 28

Height of each step = 20 cm

Time taken = 5.4 s

Mass of student = 55 kg

Acceleration = 9.8 $m{s}^{-2}$

due to gravity

A calorimeter of water equivalent 15g contains 165g of water at ${25}^{\circ }C$. Steam at ${100}^{\circ }C$ is passed through the water for some time. The temperature is increased to ${30}^{\circ }C$ and the mass of the calorimeter and its contents is increased by 1.5 g. Calculate the latent heat of vaporization of water. Heat capacity of water is $1cal/g^{\circ }C$

The medium of exchange in gold during the Gupta period was known as the

While measuring the length of a small rod using a vernier callipers, the difference between the observed length and the true length turned out to be $0.4mm$. When the jaws are made to touch each other, the 3rd division on the vernier scale coincides with a division on the main scale, then the least count of the callipers is:

The magnitude of force needed to produce an acceleration of 4 $m{s}^{-2}$ in a ball of mass 6 kg is

We can see objects due to ___ of light.

Which of the following figure correctly shows the centre of curvature?

See i am having a lot of problem in friction please explain the given concepts in detail which are mentioned below:

1.How the frictional force is proportional to the Reaction force in both the kinetic and static friction please do explain in detail......

What happens to the pitch of a sound if its frequency increases ?

a body at rest opposes the forces which try to move it. name the property called and give an eg.

The velocities of sound waves in four media P, Q, R and S are 18,000 km/ h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance ?

(a) P

(b) Q

(c) R

(d) S

Match the following devices with their type of units:

A boy travels 5 km to the south and turns west to travel 13 km. Finally, he travels on the same path, 9 km due east and stops. What is his displacement from the initial point?